To change an input file written in a foreign language to your favorite language use \include "…language….ly" and \displayLilyMusic { \melody }.
The translation is by default written to the log; you can redirect this output to a file of your choice using the command lilypond.exe >yourfile.ly (with windows).
The result of the snippet will be in absolute pitch:
{
c8 d e f g a b c |
cflat dflat eflat fflat gflat aflat bflat cflat |
csharp dsharp esharp fsharp gsharp aflat bsharp csharp |
\bar "|."
}